Hey!
I am trying to figure out how to reliably maintain a connection to
libvirtd. From the documentation, I would expect something like that:
- virConnectOpen()
- virConnectRegisterCloseCallback()
- virConnectSetKeepAlive()
- Application logic
And in the registered callback, I would:
- virConnectUnregisterCloseCallback()
- virConnectClose()
- virConnectOpen()
- virConnectRegisterCloseCallback()
- virConnectSetKeepAlive()
However, looking at the source code of virsh, I see that it additional
stuff, notably:
- virConnectIsAlive()
- checking error codes of all calls to check if they are the result of
a disconnect
Are those steps needed? Randomly checking virConnectIsAlive() doesn't
seem reliable. Checking individual error codes either (maybe I will miss
one of them or misinterpret another one).
virsh code uses those error codes to check if there is a disconnection:
(((last_error->code == VIR_ERR_SYSTEM_ERROR) &&
(last_error->domain == VIR_FROM_REMOTE)) ||
(last_error->code == VIR_ERR_RPC) ||
(last_error->code == VIR_ERR_NO_CONNECT) ||
(last_error->code == VIR_ERR_INVALID_CONN))))
Any hint?
--
Program defensively.
- The Elements of Programming Style (Kernighan & Plauger)
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